Core removing device



Aug. 26, 1941.

R. FRUTQHEY CORE REMovING DEVICE Filedllarch 2l, 1940 'mvEN-ronandlfuzgy H IS ATI'QRN EY.

Patented. Aug. 26, 1941 CORE REMOVING DEVICE Raymond Frutchey, Easton,Pa., asslgn'or to I Ingersoll-Rand Company, New York, N. Y., a lcorporation oi' New Jersey Application March 21, 1940, Serial No.325,1*68

(Cl. Z55-'12) 3 Claims.

This invention relates to core removing devices, and more particularlyto a core removing device for both severing a rock core from the massand removing it from a drill hole.

Heretofore, it has been customary to elevate the drilling or coreforming mechanism to a considerable height above the core and then setoi an explosive charge in the bottom of the kerf to rend the core freefrom the bed. This practice has the disadvantage, however, that when thecore is freed it usually tilts against the side wall of the drill holeand makes it a difficult matter to insert the core into the core liftingdevice.

In accordance with the practice of the invention, it is contemplated toequip the core lifter with a holder for supporting an explosive charge.The assembly is then disposed in the kerf and the explosive charge isset oi to break the core at its base. Thus,v any tilting movement of thecore that may be caused by the explosion will take place within the corelifter which may then be conveniently adjusted into gripping engagementwith the core.

It is accordingly an object of the present invention to minimize thetime required for placing the core lifter in the correct grippingrelationship with the core and thereby shorten the idle periods betweendrilling operations.

Further objects will be in part obvious and in part pointed outhereinafter.

In the drawing accompanying this specication and in which similarreference numerals refer to similar parts.

Figure 1 is an elevation, partly in section, of the core removingdevice, and

Figure 2 is a transverseview, in elevation,'taken through Figure 1 onthe line 2-2. l

Referring more particularly to the drawing, designates, in general, thecore removing device comprising a. core '.lifter 2l arranged in a kerf22 to encircle a rock core 23.

The core lifter 2l, shown for the purpose of illustration, is of a knowntype comprisinga casing 24 and a sleeve 25 movable longitudinally withinthe casing for effecting gripping engagement with and the release of thecore 23. 'I'he lower part of the sleeve 25 is .slotted longitudinally toprovide flexible ilngers 26 and on the inner surfaces of the lower partsofthe fingers are serratlons 21 for gripping .the core 23.

The outer surfaces of the lingers 26, in the transverse plane of the'sei-rations 21; have in clined surfaces 28 for cooperation with Aa,coniform surface 29 in the front end of the casing 24 to flex thelingers inwardly and' thereby cause the serrations 21 to be pressed intothe surface of the core.

The upper ends of the, casing 24 andthe sleeve 25 are closed by endwalls 30 and 3|, respectively..

and on the end wall 3| is an ar'm 32 that extends through an aperture 33in the wall 30 and is pivotally connected at its upper end to a link 34by a draw pin 35. The link 34 has an aperture 36 to accommodate a cablewhereby the core remover may be raised and lowered..

The arm 32 and the link 34 carry sheaves 31 and 38, respectively. Sheavs39 are also arranged on the opposite sides of the aperture 33 on theouter surface of the wall 3,0 at a lower elevation than the sheave 31and in the same transverse plane as the sheaves 31 and 38. An endlesscable or rope 40 is'trained over the upper sides oi the sheaves 31 and38 and around the lower sides of the sheaves 33.

The arrangement of thegcable and draw pin is such that when it' isintended to lower the core lifter into the kerf the linkl 34 isconnected to .the arm32 by .the draw pin 35 and after the core lifterhas been positioned correctly the draw pin 35 is removed. Lifting forcemay then that extend through the end wall 30 and have nuts 4 2 Vto seatagainst the end wall 30 for effecting relative longitudinal movementbetween the sleeve and the casing.

In accordance with the practice of the invention, the casing 24 isprovided, on its lower end,

with a plurality of legs 43 to seat upon the bottom of the kerf 22. Onthe end surface 44 of the casing between the legs 43 are apertures 45that extend longitudinally of the casing to receive the ends 46 of aholder 41 which may consist of a. resilient member, as for example round-wire. of which the portion 43 lying exteriorly of the casing 24 isbowed. y

The bowed portion 43 preferably lies rearward ly of the free ends ofthelegs 43 in order to avoid contact with the bottom of the ker! 22. Ar-

ranged on the inner side of the bowed portion 48 isa cartridge 49 o!explosive material and said cartridge may, as shown, be lashed to thebowed portion by cords 50.

The cartridge 43' carries a detonator 5l, and an ignition wire 52 isconnected to the detonator and ,extends upwardly through the corelifter. Preferably, the ignition wire is shielded by a conduit 53arranged within the casing 24 to which it may be secured in any suitablemanner.

' In practice, an explosive cartridge 49 is sei cured to the holder 4land the core removing device is then lowered into the ker! untilthe legs43 seat upon the 'bottom thereof. The explosive cartridge 49 is then setoil! to sever the lower end 4 of the core from the mass. Thereafter thesleeve art that, in the event that it be intended to remove a core oflarge diameter, additional holders may be attached to the casing 24 tosubject different points of the base of the core to the shocks ofexplosion.

I claim: l

1. A core removing device,\comprising a core lifter to encircle a .coreand having apertures in its lower end, projections extending from the flower end of the core litter, a U-.shaped holder having its extremitiesextending into the apertures, and a charge of explosive material on theholder between the projections.

2. A core removing device, comprising a corev lifter to encircle a core.projections on the lower end of the core litter, a holder between theprojections, a charge of explosive material on the holder, an ignitionwire for the explosive charge,

'and a tubular shield for the ignition wire attached to the core lifter.

3. The core removing device, comprising a. core lifter to encircle acore and having apertures in its lower end, projections on the lower endof the core lifter. a U-shaped holder between the projections having itsextremities extending into the apertures, a charge of explosive materialon the holder, an ignition wire for the explosive material, and atubular shield for the ignition wire attached to the corelifter.

RAYMOND FRU'ICHEY.

` CERTIFICATE OF CORRECTION. I Patent No. 2,255,851. August 26, 1911.1.l

.I RAYMOND FRUTCHEY.

It is hereby certified that error appears in the printed specification'of the above numbered patent requiring correction as follows: Page 2,second column, line 6, claim 1,'strike out the words "between theprojections" and insert the same vafter "holder" in line 5, same claim;and that the seid Letters Pat-ent should be read with this correctiontherein that the seme muyV conform; to the record of the4 case in the-Patent Office.

sighed ma sealed this 7th day or october, A. D. 19m.

Henry van Arsdele, (.Seal) I Acting Commissioner o1 Patents.

